Automatically threading loom shuttle



Jan. 23, i934. D. L. NORRIS; SR 1,944,802

AUTOMATICALLY THREADING LOOM SHUTTLE Filed Aug. 4, 1933 Patented Jan. 23, 1934 FATENT OFFICE AUTOMATICALLY THREADING LOOM SHUTTLE David Leland Norris, Sr., Greenville, S. C., as-

signor of one-fourth to David Leland Norris, Jr., one-fourth to Robert lvIoKim Norris, onefourth tc Andrew Middleton Norris, and onefourth to Arthur Chambers, all of Greenville,

Application August 4, 1933. Serial No. 683,697

5 Claims.

My invention relates to automatically threading loom shuttles, and has to do, more particularly, with improvements in the form and construction of threading blocks for use in such shuttles.

When an automatically threading shuttle in an automatic weft-replenishing loom is picked across the loom and comes to a sudden stop at ythe end of its flight, it sometimes happens that the filling thread from the bobbin is thrown forward against the threading block in such a way as to be carried down to the delivery eye, so that a double threading of the shuttle occurs. Frequently, this produces a loop about the threading block which causes the filling thread to break when tensionis applied thereto on the next pick of quill, or bobbin, of the shuttle.

the shuttle. One of the objects of my present invention is to provide a threading block of such form and construction as to shed the loop automatically in event of double threading, thus eliminating thread breakage arising from that cause.

I have also found that the filling thread breaks frequently in automatically threading loom shuttles, when the lling is partly used up from the Consequently,

the bobbins have to be ejected from the shuttle befo-re the lling thereon is used up. I believe that this is due to the fact that the bobbins, or quills, are not always accurately centered in the shuttle, so that, as the supply of lling on the bobbin is used up and the end of that supply approaches, there is an increased tendency for the' thread to balloon, or swirl, as it passes from the bobbin through the threading block and over the bridge in said block. However, in the threading blocks heretofore used, the construction has been such that this ballooning, or swirling, of the thread is not permitted without putting a drag upon the thread, which causes it to break. One object of my present invention is to provide an improved construction of threading block, for use in automactically threading loom shuttles, of such a nature as to permit ballooning, or swirling,

r of thethread as it passes over the bridge of the My invention is clearly dened and pointed out in the appended claims. A structure constituting a preferred embodiment of my invention is illustrated in the accompanying drawing, forming a part of this specication, in which:

Figure l is a top plan View of the forward portion of an automatically threading loom shuttie embodying my invention;

Fig. 2 is a view of the forward portion of said shuttle in side elevation;

Fig. 3 is a vertical, sectional View taken on the line 3 3 of Fig. 1;

Fig. 4 is a horizontal, sectional View taken on the line 4 4 of Fig. 3;

Fig. 5 is a view of the threading block in end elevation, the adjacent portion of the shuttle being shown in dotted lines;

Fig. 6 is a View of the threading block in side elevation;

Fig. 7 block; and

Fig. 8 is a detail View corresponding to Fig. 1, but illustrating the manner in which a loop is 'shed automatically in event of double threading.

In the drawing, the same reference numerals in the event that. double threading occurs. I v

propose to provide a threading block which has an intake channel, a bridge, and a delivery recess in advance of the bridge, vso that the filling thread, coming from the bobbin, passes through the intake channel, over the bridge, and down to and through the delivery recess, which delivers the thread to the delivery eye of the shuttle, and I propose, further, to provide a continuous, ovoid, thread-shedding surface, the rear portion of which slopes toward the entrance slot of the intake channel, while the forward portion slopes to a point in advance of the bridge.

Another feature of my invention consists in providing an intake channel of frusto-conical form, having a lateral entrance slot, with the small end of the intake channel terminating at the bridge, so that the thread, passing through the intake channel and over the bridge, is permitted to balloon, or swirl, in the frusto-conical Li i lupper surface 24 of the threading block, in

intake channel without putting a drag thereon to cause a breakage.

Referring to the numbered parts of the drawing, I have shown a shuttle 10, in which is detachably mounted a quill, or bobbin, 11, carrying the filling thread F. The forward portion of the shuttle is provided with a thread passage 12, in which the threading block 16 is mounted, and the shuttle is also cut away, at 13, so as to provide a passage, between the upper surface of the shuttle and a portion of the threading block, leading to the usual side delivery eye 14. Pins 15 are provided on opposite sides of this delivery eye, around which the lling thread is drawn, as the shuttle is picked to and fro across the loom. The filling thread F passes from the bobbin 11, through the threading block 16, and out through the delivery eye 14, as will be well understood.

The threading block, indicated generally at 16, is mounted in the thread passage 12. It include-s a base portion 16, seated on the bottom of the thread passage 12, in which the intake channel 18 is formed. As shown, this intake channel is of frusto-conical form with its axis inclined upwardly and forwardly and with the small end of the channel foremost. This intake channel 18 is provided with a lateral entrance slot 19, the rear portion of which is wider than the forward portion, as shown in Fig. 7. The front wall of the base portion 17 of the threading block, at the forward end of the intake channel 18, constitutes a bridge 20, over which the filling thread passes as it leaves the intake channel. Projecting forwardly from the base portion 17 is a horn 2l, the forward edge 22 of which tapers downwardly and rearwardly, as shown in Figs. 3, 6 and '7. A delivery recess 23 is provided in the lower edge of the horn. The threading block is provided with an upper, continuous, ovoid surface, indicated generally at 24, which serves to shed automatically a loop in event of double threading. The rear portion 25, of this ovoid thread-shedding surface, is located in the thread passage 12, and slopes downwardly toward the entrance slot 19 of the intake channel 18. A notch 26 is provided in this upper surface at the forward edge of the rear portion 25, which notch leads downwardly to the forward end of the intake channel. The forward portion 28, of this ovoid, thread-shedding surface, has a rear edge 27, which is substantially flush with the upper surface of the shuttle, and the portion 28 slopes forwardly and downwardly toward the upper end of the horn 21. The threading block 4seats on the bottom of the thread passage 12 and is provided with a transverse hole 29, through which a bolt 30, extending transversely of the shuttle, passes. In this way, the thread block is securely held in position. It should be noted that this thread-shedding surface 24 is continuous and forms a portion of an ovoid, or egg-shaped, surface, so that, as the filling thread engages this surface in the event of double threading, the loop is automatically shed when tension is applied.

When the filling thread F is carried across the threading the shuttel, the filling is first directed by the surface 25 into the entrance slot 19, and thus into the intake channel 18. Then, the filling passes through the intake channel and, from the forward end of the intake channel, over the portion 28 of the ovoid, thread-shedding surface. Continued tension causes that surface to throw the thread forwardly and off its forward end against the tapered edge 22 of the horn, so that the filling thread is directed through the passage 13 to the side delivery eye 14, and automatically disposed so that it passes over the bridge 20 and down and through the delivery recess 23 to the side delivery eye. When the shuttle has been threaded, the sudden stoppage of the shuttle at the end of its iight may throw the filling thread from the bobbin forwardly against the threading block in such a way as to cause a double threading. When this occurs, a loop will be formed, one portion of which runs from the side delivery eye 14 around the edge and over the top of the shuttle to the entrance to the intake channel, as indicated at F in Fig. 8. When tension is now applied to the filling thread, it causes this loop to slide over the face of the shuttle and the thread-shedding surface 25 of the threading block, so that the loop is automatically shed from the portion 25, and a loop is formed about the portion 28 of the threading block, as indicated at F in Fig. 8. Continued tension causes the loop around the thread-shedding surface 28, to be shed forwardly by said surface to a point in advance of the horn, so that the loop is eliminated automatically and the eiiects of double threading overcome without breakage of the filling. It will be observed that this threading block construction is such that, in the event of double threading, the loop formed will be shed automatically.

It will be noted that the filling thread F passes through the frusto-conical intake channel 18, over the bridge 20, and thence down to the delivery recess 23, through which it passes to the side delivery eye 14. This frusto-conical intake channel 18 permits a swirling, or ballooning, of 110 the thread, with reference to the bridge 20 as its point of support or contact, as the filling is fed from the bobbin 11 and through the shuttle.` This ballooning can take place without imposing a drag upon the thread to cause a breakage, and 115 I have found that this permits one to use up all the filling on a bobbin without breakage. This I consider a distinct improvement in the art, as, heretofore, it has been practically impossible to exhaust the supply of filling on the bobbins, it 120 being necessary to eject the bobbins from the shuttles while they still have some filling thereon.

I am aware that the construction herein disclosed may be varied considerably without departing from the spirit of my invention and,125 therefore, I claim my invention broadly as indicated by the appended claims.

Having thus described my invention, what I claim is:

l. In an automatically threading'loom shuttle 130 having a thread passage, and a side delivery eye, a threading block positioned in said passage and having a bridge, an intake channel leading thereto and having a lateral entrance slot, a recess alined with the side delivery eye, a horn 135 tapering toward said recess and an upper, ovoid thread-shedding surface, the rear portion of which slopes downwardly and rearwardly toward the entrance slot of said intake channel and the forward portion of which slopes toward said horn, 14D whereby a loop formed in event of double threading will be shed automatically by tension on the thread.

2. In an automatically threading loom shuttle having a thread passage and a side delivery eye, 145 a threading block having an intake channel, a bridge, a delivery recess, a horn tapering toward the notch, a thread-shedding surface sloping downwardly and rearwardly toward the intake channel, and a second thread-shedding surface 150 sloping toward the horn, said thread-shedding surfaces being portions of a continuous exposed ovoid surface, whereby the thread is automatically directed to the intake channel and over the bridge and into the delivery recess in threading and a loop is automatically shed in the event of double threading.

3. A threading block for automatically threading loom shuttles having an upwardly inclined intake channel provided with a lateral entrance slot, a bridge at the forward end of said channel, a tapered horn extending forwardly from the bridge and provided with a delivery recess in its lower edge, and a continuous, upper, ovoid, thread-shedding surface, the rear portion of which is located behind the bridge and slopes downwardly and rearwardly toward the entrance slot, and the forward portion of which lies in advance of the bridge and slopes toward the upper end of the horn.

4. An automatically threading loom shuttle having a thread passage, a side delivery eye, a bobbin and a threading block mounted in said passage, said block having an intake channel and a bridge so that thread from the bobbin passes through the channel and over the bridge on its way to the eye, the channel being formed of a continuous surface of frusto-conical form with its smaller end terminating at the bridge, said surface extending from said smaller end downwardly and rearwardly to the rear end of the shuttle block, whereby to permit ballooning or swirling of the thread as it feeds from the bobbin and passes over the bridge.

5. A threading block for automatically threading loom shuttles having an upwardly inclined intake channel provided with a lateral entrance slot, a bridge at the forward end of said channel, a tapered horn extending forwardly from the bridge and provided with a delivery recess in its lower edge, and a continuous, upper, ovoid, thread-shedding surface, the rear portion of which is located behind the bridge and slopes downwardly and rearwardly toward the entrance slot, and the forward portion of which lies in advance of the bridge and slopes toward the upper end of the horn, said intake channel being formed of a continuous surface of frusto-conical form with its smaller end terminating at the bridge.

DAVID LELAND NORRIS, SR. 

